| 알루미나 첨가에 의한 질화규소의 방전 플라즈마 소결 거동과 상전이 특성 및 기게적 특성에 미치는 영향 |
| 채재홍, 김대근, 김경훈, 박주석, 안종필, 심광보1 |
요업(세라믹)기술원
1한양대학교 신소재공학과 |
| The Effect of Al2O3 addition on the Characteristics of Sintering Behavior, Phase Transformation and Mechanical Properties of Spark Plasma Sintered Si3N4 Ceramics |
| Jae-Hong Chae, Dae-Gean Kim, Kyoung-Hun Kim, Joo-Seok Park, Jong-Pil Ahn, Kwang-Bo Sim1 |
Korea Institute of Ceramic Engineering and Technology
1Department of Materials Science and Engineering, Hanyang University |
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| ABSTRACT |
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Silicon nitride($Si_3N_4)$ is one of the most widely used structural ceramic materials. However silicon nitride is difficult to sinter because of its strong covalent bonding characteristics. In this study, $Si_3N_4$ ceramics were fabricated by spark plasma sintering process with $Y_2O_3$ and $Al_2O_3$ addition to improve the sinterability and the mechanical properties and their phase transformation behavior, microstructure and mechanical properties were evaluated. Fully densified $Si_3N_4$ ceramics could be obtained by spark plasma sintering process at a lower temperature than conventional sintering method. The formation of network microstructure was affected by the addition of $Al_2O_3$ because it could accelerate a to ${alpha}$ to ${beta}$ phase transformation of $Si_3N_4$. As a result, the mechanical properties depended on amounts of $Al_2O_3$ addition. The hardness value increased with increasing ${alpha}$-phase fraction, but fracture toughness value increase with increasing ${beta}$-phase fraction. |
| Key words:
$Si_3N_4$, Spark plasma sintering, Phase transformation, Mechanical property |
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